[chore] Prepare release v1.20.0/v0.114.0 (#11692)

The following commands were run to prepare this release:
- make chlog-update VERSION=v1.20.0/v0.114.0
- make prepare-release PREVIOUS_VERSION=1[.]19[.]0
RELEASE_CANDIDATE=1.20.0 MODSET=stable
- make prepare-release PREVIOUS_VERSION=0[.]113[.]0
RELEASE_CANDIDATE=0.114.0 MODSET=beta

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Signed-off-by: Alex Boten <[email protected]>
Co-authored-by: Alex Boten <[email protected]>

Author: opentelemetrybot